Why Your Fleet Telematics Installation Needs a Separated Pin 4/Pin 5 OBD Harness (Not a Combined Ground Cable)
The telematics unit powers up, the status LED blinks normally, but the CAN data stream drops out intermittently—often only when the vehicle is under heavy electrical load. You swap the device, flash new firmware, and check the antenna—yet the problem persists. The issue is rarely the telematics unit itself. The issue is the wiring convention you are using to […]
How 100% Continuity and 500VDC Insulation Resistance Testing Prevent Intermittent CAN Bus Failures
On a production test bench running a 2019+ J2534 flash routine, the sequence fails at block 7 of 12. The error log shows a timeout on Tester Present. You check the driver, swap the USB port, reinstall the firmware. Nothing changes. Then you press the OBD connector sideways and the counter resets. The problem was […]